H - Asp - Ala - Glu - Phe - Arg - His - Asp - Ser - Gly - Tyr - Glu - Val - His - His - Gln - Lys - Leu - Val - *Phe - *Phe - Ala - Glu - Asp - Val - Gly - Ser - Asn - Lys - Gly - Ala - *Ile - *Ile - Gly - Leu - Met - Val - Gly - Gly - Val - Val - OH *Phe=Phe(U - 13C6); *Ile=Ile(U - 13C6)